| 摘要 |
A gyro hunt damping circuit for electrically changing the phase of the excitation current applied to a synchronous motor to slowly settle changes in the lag angle of a synchronous motor and thereby dampen motor hunting, is disclosed. The current drawn by a synchronous motor is continually sensed by a current detector circuit which provides an output signal representative of the motor current. The detector output signal is applied to a comparator circuit which serves to compare average current drawn by the motor over a long time period to instantaneous current demand over short time periods. The frequency of a square wave generator, which controls the frequency of excitation current from the AC power supply of the motor, is temporarily changed in accordance with any difference between the average and instantaneous motor current demand.
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